This post is about ordered dithering in Octave. What’s is dithering? You can find a very good explanation here in wikipedia. But briefly, the idea of dithering is to create the illusion of color depth in images with (in our case) only two color quantization. This technique is used in printers, scanners, etc. We print small dots black and leave white spaces and our eyes will do the rest of the job. For those who doesn’t know, our eyes has a low pass filter as frequency response.

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